/Engine/Source/Editor/UnrealEd/Public/EditorModeManager.h
Notifies all active modes of frustum selection attempts
bool FrustumSelect ( const [FConvexVolume](API\Runtime\Engine\FConvexVolume) & InFrustum, [FEditorViewportClient](API\Editor\UnrealEd\FEditorViewportClient) * InViewportClient, bool InSelect )